Atelier Heinrichs und Bachmann

The covers for Heyne's Horror anthologies from 1974 (German translations of texts compiled by Kurt Singer) are so good, I couldn't resist buying the four volumes I recently found. The design is credited to Atelier Heinrichs, Munich. I didn't find much information online, but more covers for another Heyne series of the late 60s and early 70s, Science Fiction, credited to Atelier Heinrichs und Bachmann or Atelier Heinrichs (found on the Internet Speculative Fiction Database).